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Listing 2 12. MXML Additions to Supported Stage Layout Changes

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Flash Builder comes with several built-in templates for developing mobile projects that can be used to quickly bootstrap a new project. These include a simple Blank Application, a View-Based Application that starts on a home page, and a Tabbed Application that lets you switch between different named views. You can find more information about view and tab navigation in 3. For this exercise, choose the basic View-Based Application template, which is the default. You are also presented with options for reorientation, full-screen mode, and density scaling. Make sure to disable automatic reorientation so that the application stays in portrait mode. We cover portrait/landscape switching in more depth in 2. When you are finished on the Mobile Settings page, click Finish to create your mobile application.

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Notice that we have added a few IDs to the CheckBoxes in order to reference them from the initialize function. The naming convention is the gesture name appended with the words Enabled or Tested . The same naming convention is used in the code that sets the selected state. The init function gets called once when the view is created, and iterates through all the supportedGestures. It sets the state of the enabled CheckBox to true and adds an event listener that will set the state of the tested CheckBox to true when that gesture is used in the application. We cover gestures and the event listeners in more detail in 2, if you want to learn more about this functionality. If you run the updated example, you will get the same UI, but also trigger an error. The ActionScript error dialog is shown in Figure 1 10, and while it may be obvious to you what the issue in the program is, we will use this opportunity to demonstrate how the Flash Builder debugger works.

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Feel free to get creative with your own graphics, but keep elements in separate layers to make it easier to animate and morph them later. The next step is to create the devilish smiley keyframe at around one second. This should include motion or shape tweens for a smooth transition from the happy smiley face. Figure 2 11 shows a few time-lapsed frames that animate the smiley face as well as some of the background scene elements.

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This can be added to any key frame in your application that executes on startup, and will keep the stage top-left aligned with no resizing of the content. You can then add event listeners on orientation changes in order to modify your application to fit the screen size.

In addition to running from within Flash Professional and Flash Builder, you can also launch your application from the command line using the AIR Debug Launcher (ADL). This is also how you would test your application if you were using Flex directly without tooling support. To use ADL, you will have to download the Flex 4.5 SDK, which is a free download, or navigate to the sdks/4.5.0 folder of your Flash Builder installation. Make sure that the bin folder of the Flex SDK is in your path so you can invoke the ADL command line tool. The syntax for the ADL tool is as follows: